fail to receive GST_MESSAGE_STATE_CHANGED (GST_STATE_NULL) of pipeline, but all receive the msg for all its children

[Matthew Waters]

Not receiving READY->NULL state change messages is normal as the GstBus
attached to the pipeline is set to flushing to avoid reference cycles.

Cheers
-Matt

On 8/5/19 12:05 pm, Halley Zhao wrote:
> Hi experts:
> I want to do cleanup after pipeline changed to GST_STATE_NULL. however
> I received GST_MESSAGE_STATE_CHANGED with newstate of GST_STATE_NULL
> of its children element, but not the pipeline itself.
>
> I don't know whether there is something wrong in my code, or it is by
> design?
> my pipeline contains "appsrc-->h264parse-->videodecode-->appsink".
> here is my log:
> the source code sees attachment
>
> (cb_need_data, 148)emit eos signal
> (bus_call, 61)End of stream
>
> (bus_call, 84)my_sink state change, old state: PLAYING, new state: PAUSED
> (bus_call, 84)my_vdec state change, old state: PLAYING, new state: PAUSED
> (bus_call, 84)my_h264parse state change, old state: PLAYING, new
> state: PAUSED
> (bus_call, 84)my_appsrc state change, old state: PLAYING, new state:
> PAUSED
> (bus_call, 84)my_pipeline state change, old state: PLAYING, new state:
> PAUSED
> (bus_call, 84)my_sink state change, old state: PAUSED, new state: READY
> (bus_call, 84)my_vdec state change, old state: PAUSED, new state: READY
> (bus_call, 84)my_h264parse state change, old state: PAUSED, new state:
> READY
> (bus_call, 84)my_appsrc state change, old state: PAUSED, new state: READY
> (bus_call, 84)my_pipeline state change, old state: PAUSED, new state:
> READY
> (bus_call, 84)my_sink state change, old state: READY, new state: NULL
> (bus_call, 84)my_vdec state change, old state: READY, new state: NULL
>
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